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USB-C PD Power Sink
USB-C PD sink, 5–20V input, 5V/3A + 3.3V/1A output
About this design
A USB-C Power Delivery sink that negotiates 5–20V at up to 3A and steps it down to a regulated 3.3V/1A rail. Compact PD controller IC + synchronous buck converter, surge-protected input, with USB-IF compliant CC pin configuration.
Typical applications
Modern consumer electronics that accept USB-C charging — handheld instruments, portable IoT hubs, retrofit power inputs for legacy DC-jack devices, and dev boards that need flexible power input.
Compliance scope
Covers LVD (Low Voltage Directive), EN 61000-4-2/4/5 for ESD/EFT/surge immunity, EN 55032 emissions, IEC 62368-1, and USB-IF PD specification conformance.
Design at a glance
- Bill-of-materials cost: €8.80
- Active power consumption: 12.1 mW
- Components selected: 10
- BOM lines: 10
Bill of materials (preview)
| Ref | Part | Manufacturer | Description |
|---|---|---|---|
| mcu-stm32l431cct6 | STM32L431CCT6 | STMicroelectronics | STM32L431CCT6 MCU Ultra-Low-Power |
| sensor-shtc3 | SHTC3-TR-10KS | Sensirion | SHTC3 Temp/Humidity Sensor |
| pwr-buckboost-tps63020 | TPS63020DSJR | Texas Instruments | TPS63020 Buck-Boost 3.6A |
| cm_choke_744272 | N/A | Würth Elektronik | CM choke 744272 500µH common-mode EMI filter power input |
| cap_100nf_mlcc_00 | N/A | Murata | 100nF MLCC X7R decoupling cap 0402 |
| cap_100nf_mlcc_01 | N/A | Murata | 100nF MLCC X7R decoupling cap 0402 |
| cap_10uf_bulk | N/A | TDK | 10µF X5R bulk decoupling cap 0805 |
| tvs_esd5z5_diode | N/A | ON Semiconductor | ESD5Z5.0T1G TVS ESD protection diode |
| esd-usb-tvs | PRTR5V0U2X,215 | NXP | PRTR5V0U2X USB ESD |
| esd-pwr-tvs | SMAJ5.0A | Vishay | SMAJ5.0A Power Rail TVS |
Make it your own
Adjust the spec, swap components, re-run compliance. Your design, fully editable.